#coding=utf-8
#LightCam 日志监控程序
#init by hfh 20150212

import multiprocessing,subprocess,threading,binascii
import socket,os,time,re,traceback,sys
import lc_libs



def func(this):
	
	#agent_hostname=this['agent_hostname']
	filename=this['filename']
	keyword=this['keyword']
	interval=this['interval']
	severity=this['severity']
	schedule=this['schedule']
	holiday=this['holiday']
	
	Node=agent_hostname
	AlertGroup="MonitorLogFile"
	AlertKey=filename
	
	flagfile=lchome+'/flag/logfile_change__'+filename.replace('/','_')
	
	try:
		file=open(filename,'rb')
	except IOError:
		logdate=time.strftime('%Y-%m-%d %H:%M:%S',time.localtime())
		logfile.write(logdate+" :log file not exist\n")
		logfile.flush()
	
	buf=binascii.crc32(file.read())
	#print buf

	try:
		fc=open(flagfile,'r+')
		pointer=int(fc.read())
		if buf==pointer:
			AlertKey=filename
			Severity=severity
			Type="1"
			Summary=agent_hostname+"文件"+filename+" 未更新."
			strs=lc_libs.lc_gen_alert(agent_hostname,Node,AlertGroup,AlertKey,Severity,Type,Summary)
			print strs
			db.update_eventsdb(events_table,agent_hostname,Node,AlertGroup,AlertKey,Severity,Type,Summary)
		else:
			flagkey=1
			AlertKey=filename
			Severity=1
			Type="2"
			Summary=agent_hostname+"文件"+filename+" 已更新."
			strs=lc_libs.lc_gen_alert(agent_hostname,Node,AlertGroup,AlertKey,Severity,Type,Summary)
			print strs
			db.update_eventsdb(events_table,agent_hostname,Node,AlertGroup,AlertKey,Severity,Type,Summary)
		fc.seek(0,0)
		fc.truncate()
		#print buf
		fc.write(str(buf))
		fc.close()
	except IOError:
		#print buf
		fc=open(flagfile,'w')
		fc.write(str(buf))
		fc.close()
		fc=open(flagfile,'r+')


	
if __name__ == "__main__":

	lchome=lc_libs.lc_getlchome()
	scname=sys.argv[0].split('.')[0]
	logfilename=lchome+'/log/'+scname+'.log'
	confname=lchome+'/conf/'+scname+'.conf'
	
	today=time.strftime('%Y%m%d',time.localtime())
	os.system("mv %s %s.%s" % (logfilename,logfilename,today))
	
	logfile=file(logfilename,'a')
	logdate=time.strftime('%Y-%m-%d %H:%M:%S',time.localtime())
	logfile.write(logdate+" Started.\n")
	logfile.flush()
	
	agent_hostname=lc_libs.lc_gethostname()
	
	#初始化events数据库
	#dbfile="../db/lc_events.db"
	#tablename="lc_events"
	#tablefield="Node varchar(32),AlertGroup varchar(64),AlertKey varchar(64),Severity varchar(8),Type varchar(8),LastOccurrence varchar(32),Summary varchar(256)"
	#db=lc_libs.lc_dboperater(dbfile,tablename,tablefield)
	#db.create_db()
	#db.close_db()

	try:
		#初始化数据库
		db=lc_libs.lc_mongodb_operater('127.0.0.1',27017)

		db.connect()
		Conn=db.getConn()
		if Conn==None:
			print "Can not Connect to the MondbDB"
			exit(0)
		
		events_dbname='lc_events'
		events_tablename='lc_events'
		
		history_dbname='lc_history'
		history_tablename="lc_logfile"
		
		events_db=db.useDatabase(events_dbname)
		events_table=db.UseCollection(events_db,events_tablename)
		
		history_db=db.useDatabase(history_dbname)
		history_table=db.UseCollection(history_db,history_tablename)

	except Exception:
		excinfo=traceback.format_exc()
		logdate=time.strftime('%Y-%m-%d %H:%M:%S',time.localtime())
		logfile.write(logdate+" 初始化数据库失败:\n"+excinfo+"\n")
		logfile.flush()
		exit(0)


	MonitorList = []
	
	for lines in open(confname):
		#if line[0] == '#' or agent_hostname != line.split("\t")[0]:
		if lines[0] == '#' or lines.split("\t")[0] not in (agent_hostname,'default'):
			continue

		line=lines.strip('\r\n').split('\t')
		dconf={}
		
		#dconf['agent_hostname']=line[0]
		dconf['filename']=line[1]
		dconf['keyword']=line[2]
		dconf['interval']=int(line[3])
		dconf['severity']=line[4]
		dconf['schedule']=line[5]
		dconf['holiday']=line[6]

		flagfile=lchome+'/flag/logfile_change__'+dconf['filename'].replace('/','_')
		os.system("rm -f "+flagfile)
		
		MonitorList.append(dconf)

	usedtime=0
	
	while True:
		time.sleep(1)
		realtime=int(time.time())
		
		logdate=time.strftime('%Y-%m-%d %H:%M:%S',time.localtime())
		holiday_state = lc_libs.lc_isholiday()
		
		threads = []
		for i in MonitorList:
			if int(i['holiday']) == 1 and holiday_state == True:
				continue
				
			time_state = lc_libs.lc_schedule(i['schedule'])
			if time_state == False:
				continue
			
			flag=realtime%int(i['interval'])
			#print flag
			if flag<=usedtime:
				print i
				t = threading.Thread(target=func,args=(i,))
				threads.append(t)
		
		for t in threads:
			t.start()
			while True:
				#print len(threading.enumerate())
				time.sleep(0.01)
				if(len(threading.enumerate()) < 100):
					break

		#排除执行程序导致的时间差
		usedtime=int(time.time())-realtime
		#print "usedtime:%s" % usedtime
